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ELECTROCHEMICAL DETERMINATION OF HYDROGEN SULFIDE AT CARBON NANOTUBE MODIFIED ELECTRODES. (R830900)
Lawrence, N., R. Deo, AND J. Wang. ELECTROCHEMICAL DETERMINATION OF HYDROGEN SULFIDE AT CARBON NANOTUBE MODIFIED ELECTRODES. (R830900). ANALYTICA CHIMICA ACTA 517(1-2):131, (2004).
Carbon nanotube (CNT) modified glassy carbon electrodes exhibiting a strong and stable electrocatalytic response towards sulfide are described. A substantial (400 mV) decrease in the overvoltage of the sulfide oxidation reaction (compared to ordinary carbon electrodes) is observed using the CNT-modified electrode, with oxidation starting at ca. −0.3 V (versus Ag/AgCl; pH 7.4). The CNT-coated electrodes thus allow highly sensitive, low potential (+0.1 V), stable amperometric sensing. A wide linear dynamic range (1.25–112.5 M) was achieved with a detection limit of 0.3 M (9 ppb). The enhance sensitivity is coupled to an improved stability. Such ability of carbon nanotubes to promote the sulfide electron-transfer reaction suggests great promise for miniaturized sensors for hydrogen sulfide.
Author Keywords: Sulfide; Chemical vapor deposition; ARC; Carbon nanotubes; Electrocatalytic; Glassy carbon